#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main()
{
    int h = 0, r = 0;
    scanf("%d%d", &h, &r);
    float v = h * 3.14 * r * r;
    int c = 10000;
    int d = 0;
    while (c > 0)
    {
        c = c - v;
        d++;
    }
    printf("%d", d);
    return 0;
}
